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Since there is so much lightning here it was necessary to add a surge protector to protect the charging station from over voltage spikes. The question was how to protect the most vulnerable boundary wire. The solution is a product used to protect in-ground dog fences that I found on Amazon. You see the input wire comes from the garden first to this surge protector and then in same order to the charging station. Voila! Of course, it is even better to disconnect all the wires physically, but that is usually not easy or possible, and this product had reviews from people who had solved a problem of lost dog fence transformers for many years with success. The only problem here is that there is no protection for the guide wire, but 2 out of 3 is better than nothing, and the guide wire is at least connected to the boundary wire.